Throttle valve



M. RIVKIN THROTTLE VALVE Dec. 30, 1930.

Filed Sept. 25. 1929 2 Sheets-Sheet 25, 1929 2 sheets-sheet 2 elw M. RIVKIN THROTTLE VALVE Filed Sept.

Dec. 30, 1930.

Patented Dec. 30, 1930 TEENAHEM RIVKIN, F PHILADELPHIA, PENNSYLVANIA THBOTTLE VALVE Application led September 25, .1929. Serial No. 395,097.

My invention relates to certain improvements in throttle valves adapted to throttle the steam as it passes from` a locomotive boiler, either to the superheater or to the cylj inders of the locomotive.

One object of my invention is to so construct a throttle valve as to dispense with the usual double-seated single valve by providing a multiple-section valve in which the sections l@ can be seated in sequence.

Another object of my invention is to so construct the valve that its construction will be simplified, the valve occupying a small space within the dome or other portion oi the y locomotive.

A still further object of the invention is to provide a multiple valve in which the pilot valve is formed on the stem and the other Seetions are balanced prior to being actuated by 2o a continued movement of the stem.

In the accompanying drawings:

Fig. 1 is an enlarged sectional elevation of my improved throttle valve;

Fig. 2 is` sectional elevation showingrthe valve located in a casing designed to occupy space in the steam dome of a locomotive;

Fig. 3 is a detached sectional view of the main section of the throttle valve;

Fig. 4 isa sectionl on the line 4 4, Fig. 3;

Fig. 5 is a detached sectional view of the inner section'of the valve;

Fig. 6 is a view showing the valve located in the superheater header of a locomotive; and Y Fig. 7 illustrates a modification of the invention.

Referring to Figsl, 2 and 8, 1 is the valve casing, in the presentinstance adapted to be located in the dome of a locomotive boiler. The casing has an extension 2 at the lower end adapted to be coupled to the dry pipes of the boiler, and forming an integral part` of the casing, in the present instance, is an internal ring 3, and directly above the ring are outlets 1 for any intrapped water of condensation that may accumulate above the valve.

In the present instance, 1 locate within the ring 3 a seating ring 5 having a bevelel seat 6, upon which the beveled portion 7 of the main valve section 8 rests when in a closed bearing.

position. `The main valve 8 has guiding iingers 9 which extend through the ring 5, and actas guides for the valve when in the open position. 1() is a stem which extends through the valve and has its lower bearing in a bush.- ing 11 which is located in a bearing 12con* nected to the main valve casing by arms l13. The main valve stein is preferably reduced at the point where it extends through the The rod has a threaded portion 14 on which GU is screwed a pilot valve 15, and when this valve is in its proper position it is secured iirmly to the rod by a pin 16. The rod has a collar 17 below the main valve, which is so located as to lift the inain valve off its seat i when the rod is raised a suiiic-ient distance. rlhe pilot valve rests in its closed position against a seat 18 on the inner section 19 of the throttle valve. This inner section is beveled at 2O and rests against a beveled seat 21 of the main outer section 8 of the throttle valve, as clearly shown in Fig. 1.

A space 22 is formed between the inner section or the valve 19 and the valve stem 10, 7 and within the lower portion are internal ribs 23 which tit the portion 24 of the stem, and these ribs extend a trifle below the bottorn of the valve 19 so as to allow the shoulder 25 of the portion 26 of the valve stem to come in contact with the ribs to raise the valve 19 oli its seat. Y

It will be noticed that an annular flange 27 is formed on the lower portion of the valve 19 which is located within a recess in a hub 28 formed integral with the main valve 8. The hub 28 does not tit snugly. The hub has an opening 29 for the portion 26 of the stern. This opening is slightly larger than the stem, so as tokallow any steam or water of condensation to flow from the interior of the inner valve section 19 when the valve is in the closed position, but is closed by the shoulder 25a on the enlarged portion 10a of the stein 10 when the .stem is raised to lift the pilot valve 15 0E its seat. By this construction t-he steam which flows into the inner section 19 of the valvewill flow into'the space 22a between the hub and the lowery end of the inner sectiony 19 of the valve and substan- 100 tially balance the said inner valve so that it can be readily raised off its seat on the continued movement of the stein. lVhen the valve is closed, the shoulder a moves away from the hub 28, and any water of condensation or intrapped steam can flow through the channels between the hub 28 and the hub 31 which is formed integral with the main valve and through the passages 327150 the space below thc valve. Vhen drifting` the pilot valve can be partially opened to allow a small quantity of steam to pass through the inner section of the throttle valve to the dry pipe or other connection, as the shoulder 25a will only partially close the opening 29.

The stem l() is connected at its upper end to a head 33, which is attached to a cross bar 34 by a pin 35. This cross bar is connected to arms 36 on a shaft 37 by connecting bars 38 guided by lugs on the outer casing.

The shaft 37 is turned in its bearings 38a by an operating lever at the cab ot the locomotive which is connected by a rod to the arm 39 whichl is keyed to the shaft. In the present instance an arm 40 'forming an integral part of the arm 39 acts as a stop to limit the movement of the shaft 37, the arm 40 co1ning in contact with an abutment 4l on the valve casing.

In Fig. 6 I have illustrated my improved throttle valve located in the header 42 of a superheater. Passage 43 of this header connects with the dry pipe valve of the locomotive. In the bottom of the superheater casing are openings for the superheater tubes. The valve stem 100 in this instance is adapted to lit in a bushing 11a in the lower bearing 12a and extends through a bushing 44 in the cap 45 of the superheater header.

The valve rod 10c is connected to an arin 46 on a shaft 37a, and attached to the shaft is an arm 39a connected to the operating rod leading to the cab of the locomotive. The superheater casing, in the present instance, is made in two parts, the main part 42 described above, and a part 47, both parts being flanged and secured together by bolts or other fastenings. The part 47 is recessed at 48 to allow the arm 46 when disconnected from the rod 10a to drop into the recess` so that when the cap plate 4`is removed the rod with the valve attached can be readily removed from the casing. 4

The shaft 37a passesthrough a stui'lingbox in the part 47 as set 'forth and claimed in the companion application, filed September 25, 199.9, Serial No. 395,093.

While I have described one arrangement by which the throttle valve can be located within a casing of a superheater, it will be understood that the arrangements can be 1nodilied without departing from the essential features of the invention.

in whichv the throttle valve is made in two sections, the main section 8a and the pilot valve 15a, the pilot valve in this instance resting on a seat upon the main valve, the main valve resting on a seat ring of the casing. l/Vhen the rod 10b is raised the pilot valve will be liited oil' its scat, after which the collar 17a will engage the hub of the main valve and lift it off its seat. It will be understood, while I have shown the multiple valve made in two and three sections, the valve may be made in more sections than three without departing from the essential feature of the invention.

I claim:

l. rIhe combination in a throttle valve, of a casing; a seat in said asing; a multiple throttle valve, the outer section of the valve arranged to rest upon said seat, said outer section having two hubs, one located above the other, the said outer section having radial spaces between the two hubs, the outer section having a valve seat and an inner section adapted to close against said seat; a rod eX- tending through the said throttle valve; a pilot valve on the said rod adapted to close against a seat on the inner section, the inner section having internal ribs bearing upon the valve stein, the valve stein being enlarged below said inner section to form a shoulder which when the valve stom is raised will come in contact with the ribs and lift the inner valve off its seat after the pilot valve has been raised on the movement of the stem; and a collar on the stem arranged to lift the main valve after the inner valve has been raised.

2. The combination in a throttle valve oi a casing; a seat in said casing; a multiple valve, the outer section of said valve arranged to rest upon the said seat, the said outer section having two hubs spaced apart to form channels, said outer section also having a valve seat, the inner section of the valve adapted to close against said seat; a stem extending through the valve and having a collar arranged to raise the main section of the valve 0E its seat, the upper hub of the outer section being spaced from the inner section; the opening in the upper hub being of greater diameter than the stem; a shoulder on the stem arranged to close the opening when the valve rod is initially raised; and a pilot valve on the rod arranged to close against a seat on the inner section of the valve, the inner section having internal ribs forming steam spaces between the valve and the stem.

MENAIIEM Il-IVKIN. 

